with the correct parameters:
_IO/_IOR/_IOW/_IOWR
- The macro name specifies how the argument will be used. It may be a
+ The macro name specifies how the argument will be used. It may be a
pointer to data to be passed into the kernel (_IOW), out of the kernel
- (_IOR), or both (_IOWR). _IO can indicate either commands with no
+ (_IOR), or both (_IOWR). _IO can indicate either commands with no
argument or those passing an integer value instead of a pointer.
It is recommended to only use _IO for commands without arguments,
and use pointers for passing data.
space layout randomization (KASLR), helping in an attack.
For this reason (and for compat support) it is best to avoid any
-implicit padding in data structures. Where there is implicit padding
+implicit padding in data structures. Where there is implicit padding
in an existing structure, kernel drivers must be careful to fully
initialize an instance of the structure before copying it to user
-space. This is usually done by calling memset() before assigning to
+space. This is usually done by calling memset() before assigning to
individual members.
Subsystem abstractions